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I've said it before, but this isn't stopping with guns. One fallout of the availability of 3D printing is the ability of anyone to construct high precision parts, specifically ones needed for weapons. If AQ Khan was still operating today I'm certain this would have been a large component of his operation.

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3D printing doesn't significantly reduce the costs for building and operating nuclear enrichment systems. It's a marginal difference at most.

The costs aren't the issue, it's circumventing export control laws, allowing one to make precison parts on their own.

This report details real world examples of 3d printing being used in several weapon systems https://nonproliferation.org/wp-content/uploads/2019/09/NDS_...

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